1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef PLUGIN_CSV_HA_TINA_H
#define PLUGIN_CSV_HA_TINA_H
#include <drizzled/cursor.h>
#include <drizzled/thr_lock.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "transparent_file.h"
/*
Version for file format.
1 - Initial Version. That is, the version when the metafile was introduced.
*/
#define TINA_VERSION 1
class TinaShare
{
TinaShare();
TinaShare(const TinaShare &);
TinaShare& operator=(const TinaShare &);
public:
explicit TinaShare(const char *name);
~TinaShare();
std::string table_name;
char data_file_name[FN_REFLEN];
uint32_t use_count;
/*
Here we save the length of the file for readers. This is updated by
inserts, updates and deletes. The var is initialized along with the
share initialization.
*/
off_t saved_data_file_length;
pthread_mutex_t mutex;
drizzled::THR_LOCK lock;
bool update_file_opened;
bool tina_write_opened;
int meta_file; /* Meta file we use */
int tina_write_filedes; /* File Cursor for readers */
bool crashed; /* Meta file is crashed */
drizzled::ha_rows rows_recorded; /* Number of rows in tables */
uint32_t data_file_version; /* Version of the data file used */
};
class ha_tina: public drizzled::Cursor
{
drizzled::THR_LOCK_DATA lock; /* MySQL lock */
TinaShare *share; /* Shared lock info */
off_t current_position; /* Current position in the file during a file scan */
off_t next_position; /* Next position in the file scan */
off_t local_saved_data_file_length; /* save position for reads */
off_t temp_file_length;
unsigned char byte_buffer[IO_SIZE];
Transparent_file *file_buff;
int data_file; /* File Cursor for readers */
int update_temp_file;
drizzled::String buffer;
/*
The chain contains "holes" in the file, occured because of
deletes/updates. It is used in doEndTableScan() to get rid of them
in the end of the query.
*/
std::vector< std::pair<off_t, off_t> > chain;
uint32_t local_data_file_version; /* Saved version of the data file used */
bool records_is_known;
drizzled::memory::Root blobroot;
bool get_write_pos(off_t *end_pos,
std::vector< std::pair<off_t, off_t> >::iterator &closest_hole);
int open_update_temp_file_if_needed();
int init_tina_writer();
int init_data_file();
public:
ha_tina(drizzled::plugin::StorageEngine &engine, drizzled::TableShare &table_arg);
~ha_tina()
{
if (file_buff)
delete file_buff;
}
const char *table_type(void) const { return "CSV"; }
const char *index_type(uint32_t)
{ return "NONE"; }
/*
Called in test_quick_select to determine if indexes should be used.
*/
virtual double scan_time() { return (double) (stats.records+stats.deleted) / 20.0+10; }
/* The next method will never be called */
virtual bool fast_key_read() { return 1;}
/*
TODO: return actual upper bound of number of records in the table.
(e.g. save number of records seen on full table scan and/or use file size
as upper bound)
*/
drizzled::ha_rows estimate_rows_upper_bound() { return HA_POS_ERROR; }
int doOpen(const drizzled::TableIdentifier &identifier, int mode, uint32_t test_if_locked);
int open(const char *, int , uint32_t ) { assert(0); return -1; }
int close(void);
int doInsertRecord(unsigned char * buf);
int doUpdateRecord(const unsigned char * old_data, unsigned char * new_data);
int doDeleteRecord(const unsigned char * buf);
int doStartTableScan(bool scan=1);
int rnd_next(unsigned char *buf);
int rnd_pos(unsigned char * buf, unsigned char *pos);
int doEndTableScan();
TinaShare *get_share(const char *table_name);
int free_share();
int repair(drizzled::Session* session, drizzled::HA_CHECK_OPT* check_opt);
/* This is required for SQL layer to know that we support autorepair */
void position(const unsigned char *record);
int info(uint);
int delete_all_rows(void);
void get_auto_increment(uint64_t, uint64_t,
uint64_t,
uint64_t *,
uint64_t *)
{}
/* The following methods were added just for TINA */
int encode_quote(unsigned char *buf);
int find_current_row(unsigned char *buf);
int chain_append();
};
#endif /* PLUGIN_CSV_HA_TINA_H */
|